Summer Heat And Your Roof

When the cold weather of winter starts to retreat and temperatures began to rise, it's a good idea to consider how sunny days and high temperatures can affect your asphalt shingle roof. The increased heat of the summer months can have a negative impact on your roof in some situations. Here are some potential issues to watch for when hot weather arrives in your location.

UV Radiation

The sun produces ultraviolet (UV) radiation that can damage your roof. Because sunlight is stronger during the summer, homeowners should be aware of possible harm to their roofs from UV rays. The problem with this type of radiation is that it breaks down the chemical composition of asphalt shingles over time. Asphalt shingles have an oily substance on their top that protects them from damage. When UV radiation breaks down this substance, the shingles may become dry and start to crack.

Thermal Shock

Another issue with high summer temperatures and asphalt shingle roofs is known as thermal shock. The phenomenon occurs when high temperatures during the day and much cooler temperatures during the night cause your roofing materials to expand and contract due to the temperature contrast. This expansion and contraction can cause the shingles to crack or buckle over time. So if you live in a region where the daytime and nighttime temperatures have a large divergence, this is something you should be aware of.


Hotter weather can lead to warm, humid air becoming trapped in your crawlspace or attic. The condensation process might then lead to excessive moisture doing damage to the underside of your roof, such as the roof rafters. In some cases, the moisture will affect your roof sheathing and underlayment and cause your asphalt shingles to curl. The best way to prevent this issue from occurring is to ensure that your attic or crawlspace has adequate ventilation so that warm air does not stay in the house but escapes to the outside.

Another issue with high humidity in the summer months is moss and lichen. Hot, humid conditions are a breeding ground for these organisms. The difference between the two is that moss is a plant and lichen is a fungus. They are both unsightly and you will want to remove them to improve your home's curb appeal.

To learn more about how high temperatures can have a negative impact on your roof and what to do if problems arise, contact a professional roofing company such as Schultz Roofing & Repairs, LLC.